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A009161 as a simple table

na(n)
01
1-1
22
3-4
416
5-56
6328
7-1576
811712
9-70912
10638720
11-4668544
1249459840
13-423673472
145159926528
15-50674728448
16697030680576
17-7717401038848
18118233272496128
19-1456461190426624
2024578235697610752
21-333308651379949568

[1,-1,2,-4,16,-56,328,-1576,11712,-70912,638720,
 -4668544,49459840,-423673472,5159926528,
 -50674728448,697030680576,-7717401038848,
 118233272496128,-1456461190426624,
 24578235697610752,-333308651379949568]